<div id="fileCleanApp" class="fileCleanApp">
    <button class="clean-viewdir ladda-button" data-color="green" data-spinner-color="green" data-style="expand-right" data-size="xs">
         <span class="ladda-label">清理文件</span>
    </button>
</div>
<style>
    .fileCleanApp{
        text-align: center;
    }

</style>